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Detection of Laser Excited Surface Acoustic Waves by Infrared Radiation

: Arnold, W.; Paul, M.; Kubyshkin, A.

Review of scientific instruments 71 (2000), No.3, pp.1429-1432
ISSN: 0034-6748
ISSN: 1089-7623
Journal Article
Fraunhofer IZFP ()
ultrasonic wave; infrared radiation; wave propagation behavior; interferometry

Remote detection of ultrasonic waves is shown experimentally by measuring the infrared (IR) radation accompanying the adiabatic propagation of surface waves. The Rayleigh waves were excited by a pulsed Nd:yttrium-aluminum-garnet laser on the surface of a steel sample at temperatures up to 700 °C. The observed time-of-flight data of the Rayleigh waves correspond to values obtained by optical interferometry and the measured signal-to noise ratio of ~0.1 agrees with the estimated value using an IR detector with a sensitivity of D*=1.7X109mm/Hz/W. Further improvements of IR detection may lead to a viable tool for laser ultrasonics.